It was pretty easy, bought two "spare" bumper brackets, cut a square hole in the end, took a spare 50" Thule load bar, but it in half, drilled a hole throught the bumper bracket and load bar, bolted everything up and now I am good to go for up to two bikes, the picture shows the bars slid in further than how they ended up.

 Nice split!!! I need to make a rack for my bus